Malicious PDF — malware analysis report

Static analysis result for SHA-256 891524eb8a621e31…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82172590acdcecf9fd8265b6a4125766 SHA-1: a1fa16b8259724b5d9db067b23643c52317fccfc SHA-256: 891524eb8a621e31734fc313412465a8184f1cdef7c94491b5d15e0315170764
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, employing an image-only interface with embedded JavaScript to redirect users to external URLs. The presence of numerous links to potentially compromised websites and the ML classifier's high confidence score indicate a malicious intent, likely to facilitate credential theft or further malware delivery. The embedded JavaScript is likely responsible for initiating the redirection to the attacker-controlled domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=force+awakens+torrent
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/33209722994.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d923a4f343---98157601856.pdf
    • http://sns.hu/_user/file/sazumiro.pdf
    • http://guojingmall.com/userfiles/file///15014759658.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/vakusonabedenokivikatolor.pdf
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/pidojipoxixof.pdf
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75022470486.pdf
    • http://teifsepahan.com/files/file/fekemop.pdf
    • http://dailycan.com/userfiles/files/63517714359.pdf
    • http://simp-q.ru/userfiles/file/36017984352.pdf
    • http://esipro.lu/userfiles/file/23270948775.pdf
    • http://kasargod.net/uploads/file/tazuzevotif.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2197103c5651887fa519da360aa33543/zunovexaronimezuzorodexuj.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/6165739999.pdf
    • http://jandenzobv.com/image_uploads/file/duguratokimuf.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3ffc34c52---pafolalu.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/95475337801.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/ruxosepivosuzefikez.pdf
    • http://soc-in.com/data/media/files/86884089891.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9442ea44f956b7de7f1c27ff21ea0d80/71671100113.pdf
    • http://atek-ent.com/upload/file/97695740202.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161500eed3db65---zudelukadijuxuxokefowif.pdf
    • http://devison-matras.com/upload/file/60289200658.pdf
    • https://beyondpins.com/calisma2/files/uploads/72830611059.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae7e.bin
780515104e54237dfc753e94732993e900e1b90ba55bbd721e5436e9180d49be
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 13948 bytes
font_01_sfnt_off0000d131.bin
91f6a51cb7388ad9e159dfb1a3d9c2fb64e0985bd031627b8a495bc5885d0526
pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 10240 bytes
font_02_sfnt_off0000e86d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 16792 bytes